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Related Concept Videos

Methods of Obtaining Topography01:25

Methods of Obtaining Topography

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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
28
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Plotting of Topographic Maps01:29

Plotting of Topographic Maps

17
Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
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Multicompartment Models: Overview01:14

Multicompartment Models: Overview

61
Multicompartment models are mathematical constructs that depict how drugs are distributed and eliminated within the body. They segment the body into several compartments, symbolizing various physiological or anatomical areas connected through drug transfer processes such as absorption, metabolism, distribution, and elimination.
These models offer a more comprehensive representation of drug behavior in the body than one-compartment models. They accommodate the complexity of drug distribution,...
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Topographic Surveying and Contours01:29

Topographic Surveying and Contours

26
Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
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Levels of Use of a GIS01:29

Levels of Use of a GIS

18
Geographic Information Systems (GIS) operate across three levels of application, each representing an increasing degree of complexity: data management, analysis, and prediction. These levels reflect the expanding functionality and versatility of GIS technology in handling spatial data for diverse purposes.Data ManagementAt its foundational level, GIS serves as a tool for data management, enabling the input, storage, retrieval, and organization of spatial data. This level is often employed in...
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Related Experiment Video

Updated: May 10, 2025

Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
09:19

Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging

Published on: April 18, 2025

197

Harnessing Multiscale Topographic Environmental Variables for Regional Coral Species Distribution Models.

Annie S Guillaume1, Renata Ferrari2, Oliver Selmoni3,4

  • 1Geospatial Molecular Epidemiology Group (GEOME), Laboratory for Biological Geochemistry (LGB) École Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland.

Ecology and Evolution
|April 24, 2025
PubMed
Summary

Topographic variables from bathymetry digital elevation models (DEMs) improve marine species distribution models (SDMs) for Acropora corals. Optimal resolutions vary, highlighting the need for multiscale approaches in conservation.

Keywords:
bathymetry digital elevation model (DEMs)multiscale analysesseascape ecologyspatial scalespecies distribution modelling (SDM)terrain attributes

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Area of Science:

  • Marine ecology
  • Geospatial analysis
  • Biodiversity conservation

Background:

  • Effective biodiversity conservation requires accurate species distribution data, which is often limited for marine sessile species.
  • Topographic variables derived from digital elevation models (DEMs) can serve as valuable proxies for marine organism distributions, especially where traditional data is scarce.

Purpose of the Study:

  • To assess high-resolution bathymetry DEM sources for accuracy.
  • To utilize derived topographic variables for regional coral species distribution models (SDMs).
  • To develop a transferable framework for integrating multi-resolution variables into marine spatial models.

Main Methods:

  • Processed three bathymetric DEMs (Allen Coral Atlas, DeepReef) at varying resolutions (10m, 30m, 100m).
  • Generalized DEMs to multiple nested spatial resolutions (15m-120m) and derived eight topographic variables.
  • Assessed SDM sensitivity to DEM source and spatial resolution for three Acropora coral species.

Main Results:

  • Both Allen Coral Atlas and DeepReef DEMs demonstrated similar vertical accuracies and produced relevant topographic variables for marine SDMs.
  • Slope and vector ruggedness measure (VRM) were identified as the most relevant topographic variables for all three coral species.
  • Optimal spatial resolutions for SDMs ranged between 15m and 60m, varying by variable type and species, indicating that finest resolution is not always best.

Conclusions:

  • Multi-resolution topographic variables offer nuanced insights into the multiscale drivers of regional coral distributions.
  • A practical and transferable framework was developed to facilitate the adoption of multiscale SDMs for improved marine conservation and management planning.
  • This study demonstrates the utility of DEM-derived topographic variables for enhancing marine spatial modeling and conservation efforts.